144 Annals of the South African Museum. 
Near Cape Point (browningii, Browning). Bredasdorp ; Cape Point 
(eratina, Layard). 
Prionacis was founded on a single specimen furnished by Layard 
from Bredasdorp ; browningii on two found by Browning near Cape 
Point ; eratina on shells in coll. Layard from Bredasdorp and Cape 
Point. 
In the recently dispersed Layard collection was a tube labelled 
“erateina”’ containing shells from Cape Point and Bredasdorp. 
These were identical with original browntingii in the Cambridge 
Museum. Prionacis was differentiated by Benson from browningi 
on account of larger size, less close plication, extending further down 
on the underside, and wider umbilicus. All these points are con- 
sistent with the increasing growth of the shell, young examples of 
which are almost imperforate, and show no basal sculpture. It 
seems advisable to unite the three species, of which prionacis has 
priority. 
268. TRACHYCYSTIS PYCNOTRICHA, Melv. & Pons. 
1899 Trachycystis pycnotricha,M.&P.,A.M.N.H.iv.p.197.pl.3,£.7. DF. 
Type in British Museum. 
Hab. Carr or Goop Horr. Kowie River (Cox). 
269. TRACHYCYSTIS RARIPLICATA (Benson). 
1849 Helix rariplicata, Bs.in Mss., Pfr., Zeitschr.f. Malak.vi.p.71. D. 
1850 : , A.M.N.H. vi. p. 254. D. 
1853 , Pfr., Conch. Cab. p. 323. pl. 129 (1852), 
f. 31-33. D.F. 
Fr - », Rve., Conch. Icon. pl. 174, f. 1183. D.F. 
7 ein... Mion, Eel aup.96.. 2: 
1879 Helix ( (Pella) rariplicata, Gas Binn., Ann, N.¥. Acad. Sci. i. 
p. 361. pli 4408.0. 2 A. 
1884 Pella rariplicata, Bs., Binn., Ann. N.Y. Acad. Sci. iii. p. 89. 
pl. Byte ee. 
1887 Helix (Pella) rariplicata, Bs., Tryon, Man. of Conch. iii. p. 107. 
pl. 20 i325 BOER. 
Type in Stettin Museum. 
Hab. Care Prninsuta. Green Point Lighthouse (Benson ; 
Layard). 
Examples presented to the British Museum as rariplicata by 
Gibbons in 1876 have proved to be not that species, but sabuletorwm. 
As Binney obtained his specimens from Gibbons, his articles in all 
probability refer to the last-mentioned species. 
